DC motor

A DC motor is an electric motor convertig DC electrical energy into mechanical energy, often via interaction of magnetic fields and current-carrying conductors. Essentially, it's a machine that spins when powered by DC electricity.

=Torque=

Torque made by a DC motor: 

T = k*Φ*Ia

• T  = torque in N•m ( proportional to Flux )

• N = speed; inversely proportional to Flux

• k = a constant for motor in (N•m)/ (Wb•A)

• Ia = armature current in amps

• Torque is proportional to flux and armature current: If flux (Φ) rises, torque rises.

If armature current (Ia) rises, torques (as the same Φ)

• Speed (N) is inversily proportional to flux: From the back EMF equation: Eb = V - IaRa = KΦN

  • Eb = back EMF

  • V = supply voltage

  • Ra = armature resistance

=Torque=

In series, DC motors, Φ is proportional to Ia²: T = kIa²

Controlling current controls torque, which speed.

=References=

• https://www.canva.com/design/DAGqhkKj8fo/5rXcqu1RaejGSVSDwaUZGg/edit

• https://www.iqsdirectory.com/articles/electric-motor/dc-motors.html

• https://en.wikipedia.org/wiki/Counter-electromotive_force

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